Leading ladies light up! During an appearance on appearance on Watch What Happens Live on Thursday, Oct. 30, American Horror Story's Kathy Bates made a confession about the time last year when she smoked pot with one very famous woman.

The Oscar winner, 66, took part in host Andy Cohen's "Plead the Fifth" segment, where guests are asked three questions and allowed to skip — or "plead the fifth" on one of the burning inquiries. 

Bates was first questioned about her time filming Titanic, and asked which of her costars she would not have room for on her raft. After struggling to name one, she landed finally on Billy Zane

When answering the second question, the Misery star revealed her famous smoking buddy. 

"Kathy Bates, who is the bigger pothead: Susan Sarandon or Matthew McConaughey?" Cohen, 46, asked.

"Oh, that's tough… Is this gonna get them into trouble legally? Is this going to get me into trouble legally?" the actress pondered.

Pushing Bates to answer, Cohen asked if the bigger stoner was in fact McConaughey. 

"No… No, cause I played his mother in Failure to Launch, he's a sweet boy," she said of the star and the 2006 film. "He was headed down the wrong path and now he's [taking off]." 

"Sarandon — you're giving it to Sarandon," Cohen countered. 

"Well, I actually shared some dope with her last June," Bates admitted. "Yeah, I was with Melissa McCarthy, we were shooting Tammy, and I was staying at Susan's house in Figure Eight Island off Wilmington, and she had some good s--t… but I didn't inhale!"

See Bates' AHS costars Emma Roberts, Angela Bassett, and Sarah Paulson react — priceless! — and watch her answer the third "Plead the Fifth" question in the video above!